LTC3633EUFD#TRPBF

ActiveVoltage Regulators - DC DC Switching Regulators28-Lead

IC REG BUCK ADJ 3A DL 28QFN

LTC3633EUFD#TRPBF is a dual-channel 3A, 15V monolithic synchronous step-down regulator in a 28-lead QFN package, featuring a 3.6V to 15V input range, adjustable 500kHz to 4MHz switching frequency, 0.6V reference, and a low-power 2.5V linear regulator.Checked against the datasheet

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Technical parameters

Key specs

Input voltage3.6 ~ 15 V

Output voltage600 mV

Output current3 AMax

Switching frequency500 kHz ~ 4 MHz

Datasheet-verified parameters

22 items

Parameter	Value and test conditions	Source
Input Voltage Range	3.6V to 15V
Output Voltage	0.6V Reference Allows Low Output Voltages
Output Current	3A per Channel
Switching Frequency	500kHz to 4MHz
Package	28-Lead (4mm × 5mm) Plastic QFN
Operating Temperature Range	-40°C to 125°C
Grade	E (Commercial)
RoHS	Lead Free Finish
Absolute Maximum Ratings - Input Voltage	VIN1, VIN2: –0.3V to 16V
Absolute Maximum Ratings - Operating Temperature	–40°C to 125°C
Storage Temperature Range	–65°C to 125°C
Efficiency	Up to 95%
Low Duty Cycle Operation	5% at 2.25MHz
Phase Select	Selectable 0°/180° Phase Shift Between Channels
Operating Mode	User Selectable Burst Mode Operation or Forced Continuous Operation
Protection Features	Short-Circuit Protected, Overvoltage Input and Overtemperature Protection
Internal Linear Regulator	Low Power 2.5V Linear Regulator Output
Power Good Output	Power Good Status Outputs Available
Thermal Resistance	θJA = 43°C/W (QFN)
Minimum Off-Time	Typically 40ns
Minimum On-Time	Typically 20ns
Overtemperature Protection Threshold	Turns off at ~150°C, returns at 140°C

All parameters (21)ExpandCollapse

Power
Current - Output	3A
Voltage - Input (Max)	15V
Voltage - Input (Min)	3.6V
Voltage - Output (Max)	14.7V
Voltage - Output (Min/Fixed)	0.6V
AC and DC characteristics
Frequency - Switching	500kHz ~ 4MHz
Environment and package
Mounting Type	Surface Mount
Operating Temperature	-40°C~125°C(TJ)
Package	Tape & Reel (TR); Cut Tape (CT); Digi-Reel®
Package / Case	28-WFQFN Exposed Pad
Supplier Device Package	28-QFN (4x5)
Other
Base Product Number	LTC3633
Function	Step-Down
Mfr	Analog Devices Inc.
Number of Outputs	2
Output Configuration	Positive
Output Type	Adjustable
Product Status	Active
Series	-
Synchronous Rectifier	Yes
Topology	Buck

Pinout and package

UFD PACKAGE 28-LEAD (4mm × 5mm… — Package: **28-Lead (4mm × 5mm) Plastic QFN**

Pin	Name	Function	Source
1		PGOOD1: Channel 1 Open-Drain Power Good Output Pin
2		PHMODE: Phase Select Input
3		VIN1: Channel 1 Input Voltage Pin
4		MODE/SYNC: Mode Select/Synchronization Pin
5		RT: Switching Frequency Set Pin
6		RUN2: Channel 2 Run Control Pin
7		SGND: Signal Ground Pin
8		PGOOD2: Channel 2 Open-Drain Power Good Output Pin
9		VIN2: Channel 2 Input Voltage Pin
10		VIN2: Channel 2 Input Voltage Pin
11		VFB2: Channel 2 Output Feedback Voltage Pin
12		TRACKSS2: Channel 2 Output Tracking and Soft-Start Input Pin
13		ITH2: Channel 2 Current Sense/Compensation Pin
14		VON2: Channel 2 Top MOSFET Gate Drive Pin
15		SW2: Channel 2 Switch Node Pin
16		SW2: Channel 2 Switch Node Pin
17		BOOST2: Channel 2 Bootstrap Capacitor Pin
18		V2P5: 2.5V Regulator Output
19		INTVCC: Internal 3.3V Regulator Output
20		BOOST1: Channel 1 Bootstrap Capacitor Pin
21		VIN1: Channel 1 Input Voltage Pin
22		VIN1: Channel 1 Input Voltage Pin
23		SW1: Channel 1 Switch Node Pin
24		SW1: Channel 1 Switch Node Pin
25		VON1: Channel 1 Top MOSFET Gate Drive Pin
26		ITH1: Channel 1 Current Sense/Compensation Pin
27		TRACKSS1: Channel 1 Output Tracking and Soft-Start Input Pin
28		VFB1: Channel 1 Output Feedback Voltage Pin
29		PGND: Power Ground Pin (Exposed Pad)

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DatasheetDatasheet · 401.3 KB · 2026-11-02 OtherOther · 734.0 KB · 2026-09-21 OtherOther · 734.0 KB · 2026-09-21

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